Question 817509: fist question my homework. need help.
x+2y=-12
3x+8y=38 Found 2 solutions by LinnW, TimothyLamb:Answer by LinnW(1048) (Show Source):
You can put this solution on YOUR website! x+2y=-12
3x+8y=38
Multiply the top equation by -3
-3x -6y = 36
3x +8y = 38 add these together
2y = 74
y = 37
Substitute in x+2y=-12
x+2(37)=-12
x+74 = -12
Subtract 74 from each side
x = -86
Substitute in x+2y=-12
-86 + 2y=-12
Add 86 to each side
2y = 74
y = 37
Check this link:
http://www.wolframalpha.com/input/?i=solve+x%2B2y%3D-12+%2C+3x%2B8y%3D38
You can put this solution on YOUR website! use elimination:
---
original:
x + 2y = -12
3x + 8y = 38
---
original:
-3x - 6y = 36
3x + 8y = 38
---
add:
2y = 74
---
y = 37
x = -86
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